for my studies i have to design a charge amplifier for a piezoelement with a capacity of 10pF and a charge of 10aC. I have to design this circuit for a frequency range from 1Hz to 1 MHz, changing the charge of 10aC to an output voltage of 10mV. this means that i need an opamp with a very high Gain-Bandwidth-Product(around 2GHz). Now I reached the problem that this Opamp also has to have low leakage, low noise, and high precision, what is hard to find. Does anyone knows such an opamp or knows a good source to search? Perhaps someone has a tricky idea how to use lower GB-Opamps?hopefully you understood my description, if not, just complain, i can try it again.